The father is 1.8 meters tall. To find this we know that Marcus is 1.5 meters tall and that his sister is 0.1 meter taller (1.6 meters) and if the father is 0.2 meters taller than the sister who is 1.6 meters tall that means the father is 1.8 meters tall.
1.5+0.1=1.6, Marcus' sister's height
1.6+0.2=1.8, Marcus' dad's height
Hope this helps, An orca
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